Create task_manager namespace and wrap classes related to TaskManager with it.

chrome/browser/task_manager/child_process_resource_provider.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_TASK_MANAGER_CHILD_PROCESS_RESOURCE_PROVIDER_H_
+#define CHROME_BROWSER_TASK_MANAGER_CHILD_PROCESS_RESOURCE_PROVIDER_H_
+
+#include <map>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "chrome/browser/task_manager/task_manager.h"
+#include "content/public/browser/browser_child_process_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace content {
+struct ChildProcessData;
+}
+
+namespace task_manager {
+
+class ChildProcessResource;
+
+class ChildProcessResourceProvider
+    : public TaskManager::ResourceProvider,
+      public content::BrowserChildProcessObserver {
+ public:
+  explicit ChildProcessResourceProvider(TaskManager* task_manager);
+
+  virtual TaskManager::Resource* GetResource(int origin_pid,
+                                             int render_process_host_id,
+                                             int routing_id) OVERRIDE;
+  virtual void StartUpdating() OVERRIDE;
+  virtual void StopUpdating() OVERRIDE;
+
+  // content::BrowserChildProcessObserver methods:
+  virtual void BrowserChildProcessHostConnected(
+      const content::ChildProcessData& data) OVERRIDE;
+  virtual void BrowserChildProcessHostDisconnected(
+      const content::ChildProcessData& data) OVERRIDE;
+
+ private:
+  virtual ~ChildProcessResourceProvider();
+
+  // Retrieves information about the running ChildProcessHosts (performed in the
+  // IO thread).
+  virtual void RetrieveChildProcessData();
+
+  // Notifies the UI thread that the ChildProcessHosts information have been
+  // retrieved.
+  virtual void ChildProcessDataRetreived(
+      const std::vector<content::ChildProcessData>& child_processes);
+
+  void AddToTaskManager(const content::ChildProcessData& child_process_data);
+
+  TaskManager* task_manager_;
+
+  // Whether we are currently reporting to the task manager. Used to ignore
+  // notifications sent after StopUpdating().
+  bool updating_;
+
+  // Maps the actual resources (the ChildProcessData) to the Task Manager
+  // resources.
+  typedef std::map<base::ProcessHandle, ChildProcessResource*>
+      ChildProcessMap;
+  ChildProcessMap resources_;
+
+  // Maps the pids to the resources (used for quick access to the resource on
+  // byte read notifications).
+  typedef std::map<int, ChildProcessResource*> PidResourceMap;
+  PidResourceMap pid_to_resources_;
+
+  // A scoped container for notification registries.
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChildProcessResourceProvider);
+};
+
+}  // namespace task_manager
+
+#endif  // CHROME_BROWSER_TASK_MANAGER_CHILD_PROCESS_RESOURCE_PROVIDER_H_